Improvement in machines for shaping chair-bottoms



2 Sheets--Sheet 1.

l. SHU-H. Machines for Shaping Chair-Bottoms.

Patented Nov. 3,1874.

ON. r

INV NTOB:

Wncssis ATTURNEYS.

2 Sheets--Sheet 2.

` 1sHuH. Machines fo-r Shaping Chair-Bottoms. N0.\55,504. i Y Patented Nov.3,13 7`4.

4wn'nuassss, I l mom I ATTORNEYS.

JAcoB sHUH, oE BERLIN, CANADA,

PATENT CEEICEo ASSIGNOR TO HIMSELF AND JOHN SH UH, OF SAME PLACE.

IMPROVIENT IN M-ACHINES FOR SHAPING CHAIR-BOTTOMS.

Specieation forming part of Letters Patent No. 156,504, dated November 3, 1874; application tiled July 1l, 1874.

To all whom it may concern:

Be lit known that I, JACOB SHUH, of Berlin, in the Province of Ontario and Dominion of Canada, have invented a new Improvement in Machines for Shaping Chair- Bottoms, of which the following is a specification:

The machine is designed for hollowing and shaping the upper side of wooden chair-bottoms in an efficient, expeditious, and economical manner. It comprises mechanism for 4holding the plank of which the bottom is to be made upside down over a rotary cutter, and gaging it to the cutter so as to cut to the required depth and shape, both on the bottom lthe work. The holding coutrivances are adjustable for seats of different sizes, as well as for varying the depth and form of the hollow.

- Figure l is a sectional elevation of Vmy improved machine taken on the line x x of Figs. Zand 3. Fig. 2 is a plan View. Fig. 3 is a side elevation. Fig. et is a front elevation of the cutter; and Fig. 5 is a section of the cutter taken on the line y y of Fig. 4.

Similar letters of reference indicate corresponding parts.

A representsa rotary cutter-head with scoop or gouge shaped cutters B, over which the plank, being turned upside down, is to be held for hollowing out the bottom by resting at the front and rear edges on the brackets G and D, on which it is secured by the clampscrew E. These brackets are supported, one at the front and the other at the rear of the cutter, by the extension arched bars F, which at one end are supported on a sliding carriage, G, and at the other end by the pattern-board H. To the slide they are connected by thel standard I and adjustable blocks J, being pivoted to the blocks, and the blocks being fitted on the standards so as to shift up and down on them, land having set-screws K and L for adjusting and fastening them. They rest on the pattern-board by a wheel, M, on which they are adjustable vertically by a screw-rod, N, and they are contrived in two points with fastening-screws for shifting the brackets toward and from each other for boards of different widths. The slide G is to move the plank along the cutter from side to side, and at the same time to feed it along the cutter from front to rear. It works laterally in a supporting-bed, O, which is attached to a frame, P, which carries the pattern-board H, and has a little movement toward and from the cutter-head, which, in combination with the lateral movement of the plank by the slide G, produces the curve of the back of the hollow of the seat. The slide G is worked forward and backward to move the plank over the cutter lati erally by the pinion Q on the shaft R, which gears by pinion S, idle wheel T, and pinion U, with the shaft V, which gears by bevelwheels W with vertical shaft X, which gears by reversing-pinion Y, and clutch Z, with the driving-shaft a. The.l motion reverses each time the plank moves its width along the cutter, and each time the plank is fed up for the next cut by the hand-fed screw u, which shifts the bed-frame O along the frame l?. The motion may be reversed by the hand-lever d, but provision is made for automatically shifting it by the toothed hub 'e on shaft x, the sliding rack-bar f, and the shifting-rod g, connected to the lever d, the said rod having the arm Z fixed on its middle portion and connecting with the sliding clutch Z, also stops h, by -whose alternate contact with the rack-bar f the rod is reciprocated and a corresponding movement thereby imparted to the clutch Z through the connecting-arm Z. Said stops are made adjustable on the rod to regulate the extent of movement of the latter according to the size of the chair-seat. Stops i are also mounted on the rod y, whose contact with the frame of the machine will prevent the rod sliding too far when moved or acted on by the rack-bar. This automatic operation of the reversing mechanism ensues when the machine is run at a speed ,necessary for doing its work, or even at aldwer speed; but, of course, not when run Vvery slowly, since the momentum of the'moving or shifting devices is not then sufficient to carry the clutch proper over the dead-point, or from one bevel-gear to the other. The shaft V also works a toothed slide, j, by a pinion, l, which slide has a cam-groove,

m, in which a stud-pin, u, of the frame P works to give a movement of the plank forward and backward relatively to the cutter each time it moves laterally to make the curve at the back ofthe hollow. The slot is curved, as shown in dotted lines in Fig. 2. The cutters are gouge-shaped for adapting them to hollow out the plank smoothly, and the cutter-head is contrived so as to be reversed, to be run in the opposite direction by crossing the belt for diiferentforms of seats and different kinds of timber.

Having thus described my inventioml claim as new and desire to secure by Letters Patentl. The combination of the plank-holding frame, pattern H, wheel M, laterally-traversing,r slide Gr, and feeding frame O, with a rotary cutter-head A, substantially as specified.

2. The combination of the cam-slidej with the laterally-traversing` and feeding planki holding frame and a rotary cutter-head, substantially as specified.

3. The adjustable plank-holding frame F, adjustable blocks J, and adjustable Wheel M, combined with the rotary cutter-head A, substantially as specified.

4. The toothed carnslide j, pinion l, shaft V, train U T S, shaft R, pinion Q, and toot-hed JACOB SHUH.

Witnesses G. L. PETERSON, A. J. PETERSON. 

